<template>
  <div class="hello">
    <button @click="setMessage">添加属性</button>
    {{ student.name }}
    <input type="text" v-model="student.age">
  </div>
</template>

<script>
export default {
  name: 'HelloWorld',
  data () {
    return {
      msg: 'Welcome to Your Vue.js App',
      student:{
        name:"zhangtong",
      }
    }
  },
  methods:{
      setMessage() {
      this.student.age = 15
      this.student=Object.assign({},this.student)
      console.log(this.student)
      // this.$set(
      //     this.student,
      //     'age',
      //     15
      // )
    }

  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h1, h2 {
  font-weight: normal;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
</style>
